Definition
An expression encouraging immediate action rather than procrastination.
前人稽樹，後人乘檐
You've been talking about learning a new skill; there's no time like the present!
你一直在說要學習新技能；把握當下，立即行動！
They've always wanted to travel; since they have time now, why not leave immediately? There's no time like the present!
他們一直想去旅行；既然現在有時間，為什麼不馬上出發？把握當下！
If you want to change jobs, start looking now; there's no time like the present.
如果你想換工作，現在就開始找吧；把握當下。